网络中获取json数据

<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="八维新闻"
android:gravity="center"
/>

<android.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_below="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</android.support.v4.view.ViewPager>

import java.util.ArrayList;
import java.util.List;

import com.example.weekoneex.fragment.FragmentOne;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

public class MainActivity extends FragmentActivity {

ViewPager vp;
List<Fragment> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

vp = (ViewPager) findViewById(R.id.vp);
initData();
MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager());
vp.setAdapter(adapter);
}

private void initData() {
list = new ArrayList<Fragment>();
list.add(new FragmentOne());
}

class MyPagerAdapter extends FragmentPagerAdapter{

public MyPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}

@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
return list.get(arg0);
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}

}

}

public class News {
String title;
String content;
String news;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getNews() {
return news;
}
public void setNews(String news) {
this.news = news;
}
@Override
public String toString() {
return "News [title=" + title + ", content=" + content + ", news="
+ news + "]";
}

}

import java.util.ArrayList;
import java.util.List;

public class NewsData {
String result;
int code;
List<News> newsList = new ArrayList<News>();
@Override
public String toString() {
return "NewsData [result=" + result + ", code=" + code + ", newsList="
+ newsList + "]";
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public List<News> getNewsList() {
return newsList;
}
public void setNewsList(List<News> newsList) {
this.newsList = newsList;
}

}

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.example.weekoneex.R;
import com.example.weekoneex.bean.NewsData;
import com.google.gson.Gson;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class FragmentOne extends Fragment{
ListView lv;
NewsData data;
MyAdapter adapter;
@Override
@Nullable
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = View.inflate(getActivity(), R.layout.frag_one, null);

lv = (ListView) view.findViewById(R.id.lv);
adapter = new MyAdapter();
initData();

return view;
}
private void initData() {
new AsyncTask<String, String, String>() {

@Override
protected String doInBackground(String... params) {
return getData();
}

@Override
protected void onPostExecute(String result) {
//解析Json
Gson gson = new Gson();
data = gson.fromJson(result, NewsData.class);
//设置ListView的显示
lv.setAdapter(adapter);
super.onPostExecute(result);
}

}.execute();
}

class MyAdapter extends BaseAdapter{

@Override
public int getCount() {
return data.getNewsList().size();
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(getActivity(), R.layout.list_item, null);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.item_title);
holder.content = (TextView) convertView.findViewById(R.id.item_content);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(data.getNewsList().get(position).getTitle());
holder.content.setText(data.getNewsList().get(position).getContent());
return convertView;
}

}

static class ViewHolder{
TextView title;
TextView content;
}

protected String getData() {
String result = "";
try {
URL url = new URL("http://169.254.122.215:8080/news/news.json");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int code = connection.getResponseCode();
if(code == 200){
//使用输入流获取到请求数据
InputStream is = connection.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();

int len = -1;
byte[] buff = new byte[1024];
while((len = is.read(buff)) != -1){
bos.write(buff,0,len);
}
//不管是在什么位置  是要是从字节变成字符  肯定会有一个设置编码的参数
result = new String(bos.toByteArray(), "GBK");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
}

<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ListView>

<TextView
android:id="@+id/item_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
/>

<TextView
android:id="@+id/item_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
/>